I don't know if it's a bug or just a limitation of the software, but there can be issues with ghosting and artifacts and flickering with and without SS on. If you have glow on those triangle areas, try turning that to zero, and if you want them to show up more, then try turning up self illumination. Another culprit can be DOF, although it doesn't appear to be on in those images. When I get artifacts like that I keep changing settings until they either go away or I stop caring anymore. ;-) Also, I rarely like SS on in still images--often see a lot of artifacts in stills. I only use it in animations.
Hope that gives you a place to start,
Nicole
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